Question

what should be added to 4- 3x + 9x^2 to get 3- 4x^2 - x^3​

Answer 1

Answer:

1. Simplify: (4x2 - 2x) - (-5x2 - 8x).

Solution:

(4x2 - 2x) - (-5x2 - 8x)

= 4x2 - 2x + 5x2 + 8x.

= 4x2 + 5x2 - 2x + 8x.

= 9x2 + 6x.

= 3x(3x + 2).

Answer: 3x(3x + 2)

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Answer 2

(4-3x+9x^2)+z=3-4x^2-x^3

[z=the value we should add to 4-3x+9x^2 to get 3-4x^2-x^3]

z=(3-4x^3-x^3)-(4-3x+9x^2)

z=3-4x^2-x^3-4+3x-9x^2

z=(-x^3-13x^2-1)

the value we should add to 4-3x+9x^2 to get 3-4x^2-x^3is {-x^3-13x^2-1}

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